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Fig. 3


Reference solution dynamo. Top: normalised volume averages of the squared horizontal magnetic field components, (blue) and (red), as functions of time; the black dotted line shows . Middle: horizontally averaged horizontal magnetic fields (normalised by the equipartition field strength) as functions of z and time. Bottom: mid-layer kinetic (black) and magnetic (red) energy spectra, normalised by the average kinetic energy at zm at the end of the dynamo run. The inset highlights the low wavenumber behaviour of the spectra, using a non-logarithmic abscissa to include kk1 = 0.

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